B cells

B cells are a type of white blood cell that your immune system uses to fight off infections and diseases by producing antibodies, which are special proteins that recognize and neutralize harmful invaders like bacteria and viruses. These cells are called "B cells" because they mature in the bone marrow, and once they encounter a threat, they can transform into plasma cells that churn out thousands of antibodies per second to protect your body. Think of B cells as your immune system's custom defense manufacturers—they learn to identify specific threats and then mass-produce the exact weapons needed to defeat them.